Balance testing device



Feb.` 2l, 1961 v Filed July l2, 1954 c. w. MaoMlLLAN BALANCE TESTINGA DEVICE 5 Sheets-Sheet 1 Feb. 21, 1961 c. w. MacMlLLAN l BALANCE TESTING DEVICE Filed July 12, 1954 5 Sheets-Sheet l2 Feb- 21, 1961l c. w. MacMlLLAN 2,972,256

BALANCE TESTING DEVICE Filed July l2, 1954 EShee's-Sheeei: 5

Feb. 2l, 1961 c. w. MaoMlLLAN 2,972,256

BALANCE TESTING DEVICE Filed July l2, 1954 Y 5 Sheets-Sheet 4 Zz/EZ,

, o A l 51 .Zznorf FB drle Ma/Ilan @wands/@Wm Feb. 21, 1961 c. w. MacMlLLAN BALANCE TESTING DEVICE 5 Sheets-Sheet 5 Filed July l2, 1954 United States Patent() 'i BALANCE TESTING 'DEVICE Filed July 12 19.5.4,.sen .Neem-271.

4 claims. .(ci. 73-458) This invention re'lateszto improvementsn a-devicefor .testing thel balance of rotatingbodies andrreferaparncularly to a device for testing the* balance` of "la rotating body while the. body is in.situ in itsgnormal` operational environment.

Thepresent inventionpis adaptable for testing the c011- .dition of balance of, substantially anyrotating bodylwhile the body is in situ .in its normal operationalA environment, but for purposes of illustration, theA applicability-ofi the device. to the testing of balance.ofanautomotivewheel Willbe hereinafter set forth.

Devices havev heretofore been proposed` forV ascertaining the condition of balance` or unbalance-:of automotive vehicle wheels, but'in most such devices.it. is. necessary toremove thewheelto be testedY from :the vehic1e. 'Ihis involves removing the wheel from theivehiclepmount-ing the wheelon the .testing machine; making thetes .adding weightv to, balance the wheel.;removingrthe.;wheelfrum the testing machine, and remounting it upon the-;vehicle. Obviously, this is a laborious,.timeconsuming task.

The present invention resides in. a. device which; can ascertain the state of balance of. a, vehicledwheel, without. removingv the wheel from the vehicle,it,only being necessary to jack up the wheel to be` tested; applyv the testing device; make the test. measurements; applyv the necessary counterbalancing weights, and. lower the wheel from the jack.

In ascertaining the balance of a vehicles-wheel while in situ upon the vehicle and-balancingv the wheel, almuch more accurate ultimate balance is obtained, since the wheel is balanced underAv substantially actualrunninggcon.-

dition.` This is true of all fourwheelsfof the vehiclev and is particularly importantl with respect toi the. front wheels ofithe vehicle.

Other features, objects and` advantages ofthe present invention will be apparent from the accompanying drawings and following detaileddescription.

In the drawings,

Fig. 1 is a side elevational view, partsbeing shownin section, of the improved balancetestingdeviceas applied to a vehicle wheel.

Fig. 2 is a" front elevational view of the device shown in Fig. l.

Fig. 3 is a sectional View taken on line 3 3 of'Fig. `1i

Fig. 4 is an enlargedfsecti'onal view of the-device, taken on line 4 4 of Fig. 2t l Fig. 5 is a sectional view taken on line S-SfQflFig; 4:

Fig.- 6'is a sectional view taken on line 6l-6 of Figc. 4.

Fig. 7 is a sectional view taken onlineV 7-1 of Fig. 4;

Pig. Slis'a detailed'sectionalview taken on line 8`8`of Fig. 6.

Fig. 9 is a detailed'sectionalview taken online` "9j- 9 ofFig. 6.

Fig. '10' is a view similar to, Fig.J a different position. y

Fig. 1'1 is a detailed sectional view taltenonline 11-11 ofFig. 6.

6' showngvthe partsn 2,972,256 Patented Feb. 21, 1961 ICC vFig. 12'is afview similar to` Figs. 6 and10illustrating faamodi'cationof the invention. Y n

LFi'g. 13Lis3a detailed sectional view taken on line ISI-13 of 'Fig 12.

Referring'in detail to the drawings and with specific :reference to- Fig. 1. thereof, 1 indicates aconventional :automobile wheel comprising rim Zlandweb 3. AA conventional'tire dfisyinount'ed' upon the-rim 2. Aconventionalbrake `drum assemblyf4. ismounted'upon the automobile fwheelspindle'S and the-web 3A of the wheel is normally secured to kthe drum assembly by the usual wheel-bolts 6.

Thereference numeral 7 indicates generally` theimproved balance testing ldevice 4'comprising the concepts of the. present invention, said device being adapted to be mounted upon. the wheel assembly while the wheel is maintained on the vehicle.

To mount the device 7 Yupon thewheel 1, assuming thatthe wheel 1i isa front'wheel of the vehicle, the front portionA of the vehicle is jacked up so that both front wheels are free ofthe ground. In most domestic automobiles, four, fveor six: wheell bolts are usually employed. For purposes of. illustration the wheel 1 is yshown as,being secured by six Wheel bolts. After the wheel has been jackedup, three wheel bolts, degrees apart are loosened andthe nut o'f one ofv said bolts is removed. A lug cup 8 comprising a hollow cylindrical member, openf atboth ends ispositioned over the wheel bolt and the nut is again replaced within.v the lug:y cup thereby fastening. the; lug cup upon said wheel bolts. Lug. cups, similar tog lug., cupwSl are in 'similar manner mounted upon the remaining.Wheelboltsspaced 120 degrees from the lirstementioned wheelbolt:

Each lugcup'S-is internally threaded at itsfou'ter 'end for the-receptionof an aperturedplug which thread'edly engages therespectivelugcup. Screws 10 are adaptedito engagein each apertured plug and functionto fasten an adapterplate 1-1` upon thelugcups 8;

In viewfof the `fact that the lug cupsmounted upon the wheel 1are spaced. 120 degrees apart, all ofsaid lug cups -will be of equal weight and, hence, the balance of the wheel ,willnot befinlluenced by the, addition thereto of-the lug4 cups and auxiliary plugs: and screws,v hereinbefre de.- scribed. T he samewould-be'true-were=theewheel fastened by four wheel bolts, in which case, four lug: cups would be; employed. However, were thewheel ofith'e ve-bolt type; three lug cups would be employed but one of said lugfcupswould be heavienthanv eitherA ofthe other two employed, that is, the lugcup spacedl44` degrees from the other two would be, heavier than.the other lugcups which would be spaced- 72v degrees from. each other: Thus, the lug cups and auxiliaries would add no ex-y traneous unbalance to the wheel.

The adapter plate 11, shown best in Figs. 3 and 4, comprises a circular disc having a central opening 12 in which a hub 13-is rigidly positioned, the hub13 having a central opening 14. The body ofthe disc is' provided with a plurality of circularly spacedradial slots 15, 16 andy 17, adapted for the receptionof screws 10.`

In view of. the fact that. wheel bolts ondifferent auto.- mobiles. areV spaced different distancesy from,` the centerfof the Wheel, slots rather than mere-circulanholsare provided in the adapter plate 11. Where four lug cupsare` employed, slots 15 would be utilized; WhereV live lug bolts are provided, lug cups-would be associated with one slot 15; and slots 17, and where six Wheelbolts are is not predicated upon the specific elements and members for securing the device 7 to the wheel, and any suitable securing means is contemplated. In addition, in its broad concepts the device 7 is not limited to use only in testing the balance of automotive vehicle wheels since the invention is equally applicable to the testing of balance of any rotating body, where the test is to be made upon the body while it is vin situ in its normal environment.

Before the screws 10 are tightened to hold the plate 11 upon the lug cups 8, the plate is centered on the wheel 1. This may be accomplished by a centering arbor (not shown) which may be positioned through the opening 14 in the hub 13 and held in contact with the female recess provided in the outer end of the wheel spindle 5. The wheel may then be rotated and with the screws 10 sufficiently loose, the plate will center itself relative to the wheel. Screws 16 may then be manipulated to fasten the plate rigidly with respect Ito the lug cups 8.

The device 7 comprises a frame or casting 18 having at one end a substantially cylindrical flanged portion 19, the outer surface of which functions as a seat for a pilot plate 20. rihe pilot plate carries four radially extending arms 21 (Fig. 6) which are offset adjacent their end portions from the plane of the plate. Each arm 21 is provided with a notch 22 which is engageable with a bolt 23- carried by the adapter plate 11, there being four arms 21 and, hence, four bolts 23 carried by the adapter plate. By the proper manipulation of the pilot plate, the bolts 23 can be brought into engagement with the notches 22 and by means of fastening knobs 24, threadedly engage with bolts 23, the two plates 11 and 28 may be rigidly fastened together.

The pilot plate 28 also comprises a hub 25 whichis secured by means of screws 26 to the central portion of the plate proper, said hub having an offset annular shoulder 27 which seats upon the outer surface of the hanged portion 19 of the body 18. rlhe central portion of the 'hub 25 comprises a collar 28 which is adapted to be positioned in opening 14 in hub 13 of the adapter plate. A crown gear 29 is carried upon the pilot plate and the inner peripheral portion thereof seats upon ange 19. A locking ring 38 seats in an annular groove provided in the ange 19 and functions to space the inner peripheral portion of the crown gear from the shoulder 27 of hub 25.

As will be hereinafter more fully described, the pilot plate 2i) is rotatable relative to the frame 18 under certain wardly or outwardly along sleeve 33.

test is rotated, as will be hereinafter more fully described, the adapter plate 11 rotates and, in turn, rotates the pilot plate 20. By virtue of the meshing of the crown gean 29 and spur gear 52, such rotation tends to cause worm wheel 5-1 to drive worm 46. However, in view of the high degree of friction encountered in driving the worm wheel-worrn arrangement in this direction, the driving torque thus developed causes the frame 18 to rotate with the pilot plate 20 and, hence, shaft 41 moves in orbital fashion around shaft 31.

For purposes to be hereinafter more fully described, it becomes desirable at predetermined times to change the angular relationship between pilot plate 20 and frame 18. To accomplish this change, the knob 36 may be grasped by an operator, the knob and clutch member 34 being freely rotatable with respect to sleeve 33, and the slidable sleeve 35 and clutch member may be moved in- Such movement will engage surface 39 With surface 44 or surface 40 with surface 45 and thus, while the operator prevents rotary movement of the clutch member, shaft 41 will be rotated in one direction or the other about its axis. In this fashion worm 46 will readily drive worm wheel 51 and, hence, shaft 56 will be rotated thereby rotating gear 52 relative to the crown gear 29. Hence, frame 18 will be rotated relative to the pilot plate 20 in a desired direction and for a desired degree depending upon the duration of time that the clutch member has been maintained stationary and' in contact with either surface 44 or 4S of the double conical friction head 43.

The frame 18 is provided with a cylindrical aperture 53 in which a pair of ball bearing assemblies 54 are positioned, said assemblies being spaced from each other by the cylindrical collar 55. Shank 56 of screw 57 is journaled in the assemblies 54 and a conical friction member 58 is carried at the end of said shank, said meml yber being rigidly secured to shank 56 by pin 59. A spool l'60,'having opposite conical surfaces 61 and 62 is carried by shaft 31 and is rigidly secured thereto by pin 63. The spool 60 is so positioned upon shaft 31 that the conical surfaces 61 and 62 are disposed on opposite sides of, anda-djace'nt the conical member S8. Shaft 31 extends V- through sleeves 33 and 35 and an end thereof protrudes conditions, the parts being rotatively relatively moved by i the crown gear 29. y

A shaft 31 is journaled in the frame 18 being rotatably positioned at one end in a bearing 32 carried in hub 28 of the pilot plate. Intermediate its length shaft 31 is journaled in a sleeve 33 which is rotatably and axially immovably secured to frame 18 by set-screw 37. A clutch member 34, comprising a sleeve portion 35, is slidably and rotatably movable upon the sleeve 33. At one end of the slidable sleeve portion 35 a hand grip or knob 36 is mounted, said knob being immovably mounted relative to the sleeve portion 35. A disc 38 having a conical ange 39 is rigidly carried by the sleeve portion 35 and the end of said sleeve portion terminates in a conical friction member 40.

A shaft 41 is journaled in ball bearing assemblies 42 and is positioned with its axis parallel to shaft 31. A double conical head 43, having conical friction surfaces 44 and 45 is rigidly carried upon one end portion of shaft 41. A Worm 46 is secured to shaft 41 at its op# posite end portion by means of pin 47. An aperture 48 is provided in a portion of frame 18 adjacent worm 46 and bearings 49l are positioned adjacent opposite ends of said aperture, said bearings being adapted to rotatably carry a shaft 50. At one end of shaft 50 a worm wheel 51 (Figs. 4, 6 and 11) meshes with worm 46 and at the opposite end of said shaft a spur gear 52 is mounted which meshes with crown gear 29.

The arrangement is such that when the Wheel under through knob 36. A hand gri-p or knob 64 is carried upon said protruding shaft and is rigidly secured vto the end portion of shaft 31 by means of pin 65.

The arrangement is such that when frame 18 rotates with pilot plate 20, the conical member 58 moves in an orbital fashion around spool 6l). In the operation of the device, as will be hereinafter more fully described, it becomes desirable to rotate screw 57. To accomplish such rotation, the knob 64 may be grasped by an operator thereby preventing rotation of shaft 31. A knob may then be moved inwardly or outwardly relative to frame 18, that is, the shaft 31 may be moved axially thereby moving either surface 61 or surface 62 into contact with the orbital moving conical member 58; Hence, screw 57 will be rotated by virtue of the contact made between one or the other of the conical surfaces 61 or 62 of spool 60 and the conical surface of member 58. i

A followernut 66 threadedly engages screw 57, said nut being provided with opposite ears 67 and 68. An arcuate arm 69 is pivotally secured to ear 67 and a similar arm 70 is Apivotally secured to the opposite ear 68. -A ring 71 is rotatably positioned upon the outer surface of frame 18 and a similar ring 72 is also rotatably positioned upon frame 13. The rings 71 and 72 are confined for rotation upon the frame 18 betweenv a ledge 74 which is removably mounted upon the frame. The

ring 71 carries an outwardly extending lug 75 which is pivotally secured, as at8il, to the op-posite end of the Thearrangemcnt s-.suclrthat-whenscrjew 5.7 is rotated'.

nutiogmoves.uponsaidscrewl. ...movement ofjthe. nut. 6.6." results in .rotatable movement. otttlie.. ninas 711 and.- 7.2.?. E'or, instance. itl'nut. 6.6.' srnoyed` upwardly along screw 5.7,v as.l viewed in Eig., 6,. ringll will be moved countercloclt'wise and;SinntltaneouslyI ring 72a will he moved clckwise. If, .nut .6.6 moves, downwardly. along screw 5 7'ring 71 willmove. clockwise.. and'n'na 72awill move counterclockwisc.A l v To prevent.excessmovementjoffthe nuto upon .screw STapin 83.V is.. carried by the Screw. adjacent'. its upper endand'a similar,- pin 8,4 iscarriedhy said-screw adjacent its.. lower. end.' Lugs.. 8.5 are, carried. upon. nu; 6,6 and when. the. nut` moves to. either. of its extremepositions either. pii1.83. or pin 84j wilLcntactcneL-ofithc; lugs.. 8,5 and. further. rotation. of' thesQrew 51 will be prevented. Anindicator. guidearm. 86..,is mounted,.upon..;.frame 18, one endgportion .of saidarm; beingsecurenfto` saidrame by meansofl screw 8.7. theendportion of: theY `So secured. being.. positioned. in .a's1ot 88.r PfQyded in, the frame. 1.8. The. arm. 86.. is of. substantially: rectangular cross section` and the, axis. of said. extends, diametri.-A cally opposite to the. axis; of screw... 57i. l n

It is. desirable. that. the .frame 18. and theparts.. carried vthereby be. substantially balanced. about ,theaxisl of. rota..- tion comprising, the axis of shaft 31. inasmuch .asscrew 5.7.v extendradially` outwardly from the, casting` or frame 184 the weight of-saidrscrew actson a relatively. long lever arm .relative tothe axis.. of the frame. Inv order to secure a .virtual balance of. the screw 5.7 a. weight'Y 8 9. is. posi.- tionedat the end ofthe indicator guide rod 86.

An arm. 9,0 whichiscurved adjacentits-oppositeend's is secured. at` one. end to ear 67 of..nut. 6 6. Av arm9L issimilarly secured tov ear 68. of. the nut.. Atits oppositeiendarm 9.0..isrigidly secured to. aweight 92 and..insimilarfashiony arm, 9,1 is secured to weight93. Betweenweights 92.and;.93 a plate 94. is rigidly; secured togsaid weights, saidplate havingv a struck-up portion 9.5

which is providedwithza rectangular aperture',l 96. whereby .the struckau-p. portion. 95v may. beV disposedinembracng relationship to the. arm 8.6. AS/willbe hereinafter more fullyy described the struck-upportion 95Y of the, plate 9 4 functions asa pointerwhich, depending. upon, the positionof nut 66..upon screw 57, indicates a. lbalancedcon- `dition of the device.

Ring 71 which is rotatably positionedupon frame` 18 carries` a radially extending arm 97 and at the end of said, arm. a balancing-weight. 98. is. rigidly. positioned. Similarly ring 72. carries. a radially extending.v arml 9,9. which. also. carries a balancing weight 100. atits end.

It can readily beseen that when screwv 57 is. rotated and.v nutr 6 6 moves axially. upon said screw.,nthe ,y upward org downward movement'- of the nut 66fup0nthe screw willcause the. rings 71.l and 72 toA rotate uponfratrie 18. When the rings 71 and 72 rotate.. arms 97 and- 99 move to different angular positions relative to. each-.otherthereby,v altering-the, conditionof balance of the entirerotating assembly. Inview of the fact that. thev angulan variations o f arms97 and-99 are proportionalto the movement of nut 66 along screw 5.7,'v and sincefthe movement off'nut 6,6 along screw. 5,7 is reflected in. similar movement of the s'truckup lportion. 95` along rod 86, it can readilybe seen that. the position off the struck-up p ortion of pointer v95. along rod 86.is an indicationof the` angular displacement of the. arms 97 and 99. As. will be` hereinafterv more fully described, this indication isemployed determining the condition of balance of thev wheel'under test.

A spider 10'1 is secured to. frame 18.-by. means. of screws.. 1.02v and.. the` arms. of sai-d` .spider .carry ianges .103.. A .substantially .cupfshapcd cover. 104. embraces .therear p ortionof the device.. 7 and; is4 securedje to the danses.: 10.3. by meansof' screws 105. The. cup-.shaped CQver. 104 functions, as. a closure forthe rearfrcentral portion of the device. 7..

6g balance offthe, wheel.v

. A..pan-shaped.memberv llliisalsc carriedupcnframe 1.8` andltuncticnsgessentially. as.- .a cover. for.; screw 5.7' and the remaining., portions of the deviceA 7, which. extend radially. fromtheframe 1.8.. Adjacent the guide rodj 86 alongA whiclitliepointer. 95.( travels. a slot. 197 isprovided. in. the. cover. memberr 1.06.. and.. a. calibrated scale 108` is secured' adjacent said slot by means ofrivets or the'like. 109.. Thus, when. the pointer. 95- moves along the guide. rodi. 8.6. as. hereinbefore described. the position ot said. pointerv will be, indicatedn upon, the. calibrated plate 108; Thus., the readingA ofi'the. position off the pointer. 95, uponpthe'calibrated. plate. 10.8.'- indicates the angularrelationship of the weights98, and4 100.

-Inutilifzing the device 7 tc test the. balance'of arotating bcdvg for, instance,... the. wheell illustratedr in. Eig. 1,J after the: front. wheels. of. theautomotive.. vehicle are lacked, up. and.' the adapter plate 1v1. is' secured' to the wheels andproperly centered ashereinbefore described, the. pilotpl'ate .2.0. carryiilgthe device v7. ismounted upon theadapltcl'r Plate.v The wheel under test, if it is the front vvlleeloi4 the Yveliiclt'e...will be, rotated by a conventional 'wheel'spinriing device. Initially the follower nut 66 is .positioned upon screw 57 at the upper end thereof. In thisposition ther weight arms... 97. and. 99. in the device illustratedare 180 apart.andinthisposition the device 7 is. balanced.

With the wheelrotating, the knob-'64 is graspedanl pulled outwardly` from the, wheel thereby engagingy the conicalsurface. 62 of the. spool. 60' with.the,conical mem.- ber 58; By thus engagingthe twoconical. surfaces the screwfS] is rotatedv about its axis, and theffoliower. nut 6.6.'smoveddownwardly azrelatively smalll degree. to so move the weights98. and.100. asto slightly. unbalancethe device 7.v 'I'.lieknob 36Yis thenv grasped and held so as to prevent rotation thereof. and said knob may. bepushed or` pulledtoward the wheel to engage the surfaces. 44 andf 39 orfl the surfaces 45. and 40'. Such engagement willcause shaft 41 torotate and hence spur gear. Szwill .rotate relative toA the crown gear 29. 'Ihe knob. 36` is heldin positionto engage surfaces, 44 and.39 or surfaces.

45 and 40.until'vibration evidenced by a vibratory movement ofthe bumper of the automobile decreases,` that is, until a pointis reached at which the vibration becomes a minimum. The knob 36 is then released andknob 64 grasped. and movedinwardly or outwardly. to changethe angular relationship of the weight arms 9.7 and 99.v By changingthis angular relationship. it will be foundthat the vibration will, be further decreased. When minimum vibration is noted, the knob 36 is then manipulated to rotate. shaft 41 in onev direction or theother until a point is reached' whereby the vibration becomes a minimum. It has been found that at about thesecond trial ofv ,the cyclel of operations.. mentioned, above, vibration will be substantially eliminated.'

When the vibration has been substantially eliminated by following the. hereinbefore described operationalsteps, the wheelis stoppedand theposition ofthe pointer 9.5. with respect to the calibrated scale 108 is noted. The .scale 10,8jis calibrated in terms of weights which maybe added to thewheel to properly. balance the same, the weightl indicated on the scale being added to the Wheel in a position directly. in alignment with the, scale adjaf cent its radialoutward end. Withthe counter-balancing weight added.' to the4 wheel, the operation hereinbefore described'may berepeated as a check against the tina-1 The balancer 7 is then removed from the wheel and may b'e'applied to theopposite wheel and its condition of balance may be. tested. and proper weights may. be added thereto. Inthe event that. the rear wheels,v ofy the auto motivevehicle arebeingbalancedrsad wheels may. be driven` by. the automotive; engine throughY the. gear train ofV t,l1evelri cle.l However in.-A this case, onlyy one rear .wheel is; raised. from the: ground while.: the.. other.- remains \.on...the.-ground..$0. that the-raised; wheel will-protette.'`

geraete Referring particularly to Figs. 12 and 13, 'a modification of the invention is shown. In this form of the invention, the major portion of the parts, hereinbefore described, are the same and without further description identical parts in Figs. 12 and 13 will be designated with primed numerals corresponding to the parts hereinbefore described.

The essential difference between the two forms of the invention resides in the movable `weights and their relationship to the remaining structure. A substantially crescent-shaped weight 110 is pivotally secured at one end to ear 67' of follower nut 66 which coacts with screw '57. A similar weight 111 is similarly secured at one end to the ear 68 of nut 66' on the opposite side of screw S7. At their opposite ends weights 110 and 111 are secured to a bridging member 112 which carries a struck-up apertured pointer 113 which loosely embraces the guide rod 86'. In order to normally balance the device 7 a weight 114 may be carried at the end of the rod S6', weight 114 being relatively larger tha'n weight 89 carried by guide rod 86, hereinbefore described.

It will be noted that the center of gravity of weights 110 and 111, considered together, changes relative to the center of rotation of the device 7', that is, relative to the axis of shaft 31', when nut 66 is moved, and, hence, a balancing or unbalance effect is produced by weights 110 and 111, as they are moved by nut 66', which is similar to the angular movement of the weight arms 97 and 99, hereinbefore described.

In employing the device 7 with the nut 66 positioned at the end of screw 57' adjacent pin 83 and with the wheel under test and the device 7' rotating, the knob 64 is manipulated to rotate screw 57 and thus slightly unbalance the device 7. Knob 36 may. then be manipulated to change the angular relationship of the weights 110 and 111 with respect to shaft 31 until a minimum vibration point is noted. Knob 64 may then again be manipulated to move weights 110 and 111 lengthwise of screw 57' until a minimum vibration point is reached. Knob 36 may thenagain be manipulated, and so on, until vibration is imperceptible. The position of the pointer 113 may then be noted and appropriate weight may be added to the wheel.

Of course, the devicesI 7 and 7 may be employed in ascertaining the condition of balance of rotating bodies other than automobile wheels and the invention in its broadest concepts contemplate a device for ascertaining or testing the condition of balance of any rotating body, particularly one wherein the test is made with the body in situ in its normal operational environment.

I claim as myvinvention:

l. In a device adapted to be secured to a rotatable test body for testing and measuring the unbalance of said body while said body is rotating, including counterbalancing weight means for counter balancing the unbalance in said body, means for moving said weight means circumferentially relative to said body, means for increasing and decreasing the counter-balancing effect of said weight means, control means for the two last-named means, and means which indicate the degree of effectiveness and the circumferential position of said weight means, the improvement comprising that said control means comprises an axially shiftable rotatable control shaft coaxial with the device and the axis of rotation of saidbody, an axially shiftable rotatable control sleeve concentric with and encircling said shaft, a first pair of spaced opposite conical surfaces Ifixed coaxially on said shaft, a first conical member of a size smaller than the spacing between said first conical surfaces disposed between said surfaces, a second pair of spaced opposite conical surfaces fixed on said sleeve concentric therewith, a second conical member of a size smaller than the spacing between said second conical surfaces disposed between said surfaces, said sleeve having 4a manual control knob at one end thereof, said control shaft projecting beyond said knob and having a manual control knob adjacentits end, said control shaft and said sleeve being individually shiftable axially thereof by said knobs for selectively engaging the respective conical surfaces thereon with the respective conical member selectively to cause relative rotation of the respective coni cal member in opposite directions, one of said conical members being connected with the said means for increasing and decreasing the counterbalancing effect of said weight means and the other of said conical members being connected with the said means for moving said weight means circumferentially relative to the body.

2. i In a device adapted to be secured to a rotatable test body for testing and measuring the unbalance of said body while said body is rotating, including counter-balancing weight means for counterbalancing the'unbalance in said body, means for moving said weight means circumferentially relative to said body, means for increasing and decreasing the counter-balancing effect of said weight means, control means for the two last-named means, and means which indicate the degree of effectiveness and the circumferential position of said weight means, the irnprovement comprising that said control means comprises an axially shiftable rotatable control shaft coaxial with the device and the axis of rotation of said body, an axially shiftable rotatable control sleeve concentric with and encircling said shaft, a first pair of spaced opposite conical surfaces fixed coaxially on said shaft, a first conical member of a size Smaller than the spacing between said first conical surfaces disposed between said surfaces, a second pair of spaced opposite conical surfaces fixed on said sleeve concentric therewith, a second conical member comprising a double conical head of a size smaller than the spacing between said second conical surfaces disposed between said surfaces, said second pair of conical surfaces comprising a conical surface adjacent said control shaft disposed inwardly of said second conical member relative to the axis of said control shaft and a conical surface disposed outwardly vof and in encircling relation to said second conical member thereby to provide respectively for relatively slow and relatively fast adjustment of said second conical member, said sleeve having a manual control knob at one end thereof,'said control shaft projecting beyond said knob and having a manual control knob adjecent its end, said control shaft and said sleeve being individually shiftable axially thereof by said knobs for selectively engaging the respective conical surfaces thereon with the respective conical member selectively to cause relative rotation of the respective conical member in opposite directions, one of said conical member being connected with the said means for increasing and decreasing the counterbalancing effect of said weight means and the other of said conical member being connected with the said means for moving said weight means circumferentially relative to the body.

3. In a device adapted to be secured to a rotatable test body for testing and measuring the unbalance of said body while said body is rotating, including counterbalancing weight means for counterbalancing the unbalance in said body, means for moving said weight means circumferentially relative to said body, means for increasing and decreasing the counter-balancing effect of said weight means, control means for the two last-named means, and means which indicate the degree of effectiveness and the circumferential position of said weight means, the irnprovement comprising that said control means consists essentially of a rotatable, axially shiftable control shaft coaxial with the device and the axis of rotation of the body, a rotatable, axially shiftable control sleeve concentric withV and encircling said shaft, a spool having a pair of axially spaced opposite conical surfaces mounted coaxially on said shaft, a conical member of a size smaller than the spacing between said conical surfaces disposed between said surfaces with its axis at right angles to said shaft, said conical member being connected with the said means for increasing and decreasing the counter-balancing effect of said weight means, a drive shaft disposed in spaced parallel relation to said control shaft and connected with the said means for moving said weight means circumferentially relative to the body, a double conical head member on said drive shaft concentric therewith, and a pair of axially spaced opposite conical surfaces on said Sleeve concentric therewith and disposed to opposite sides of said double conical head member, the latter member being of a size smaller than the spacing between the lastnamed opposite conical surfaces, said sleeve having a manual control knob at one end thereof, said control shaft projecting beyond said knob and having a manual control lknob adjacent its end, said control shaft and said sleeve being individually shiftable axially thereof by said knobs for selectively engaging the respective conical surfaces thereon with the respective conical member selectively to cause relative rotation of the respective conical member in opposite directions.

4. In a device adapted to be secured to a rotatable test body for testing and measuring the unbalance of said body while said body is rotating, including counter-bah ancing weight means for counter-balancing the unbalance in said body, means for moving said weight means circumferentially relative to said body, means for increasing and decreasing the counter-balancing effect of said weight means, control means for the two last-named means, and means which indicate the degree of effectiveness and the circumferential position of said weight means, the improvement comprising that said control means consists essentially of a rotatable, axially shiftable control shaft coaxial with the device and the axis of rotation of the body, a rotatable, axially shiftable control sleeve concentric with and encircling said shaft, a spool having a pair of axially spaced opposite conical surfaces mounted coaxially on said shaft, a conical member of a size smaller than the spacing between said conical surfaces disposed between said surfaces with its axis at right angles to said shaft, said conical member being connected with the said means for increasing and decreasing the counter-balancing effect of said weight means, a drive shaft disposed in spaced parallel relation to said control shaft and connected with the said means for moving said weight means circumferentially relative to the body, a double conical head member on said drive shaft concentric therewith, and a pair of axially spaced opposite conical surfaces on said sleeve concentric therewith and disposed to opposite sides of said double conical head member, the latter member being of a size smaller than the spacing between the last-named opposite conical surfaces, said sleeve having a manual control knob at one end thereof, said control shaft projecting beyond said knob and having a manual control knob adjacent its end, said control shaft and said sleeve being. individually shiftable axially thereof by said knobs for selectively engaging the respective conical surfaces thereon with the respective conical member selectively to cause relative rotation of the respective conical member in opposite directions, the said last-named opposite conical surfaces comprising a first conical surface adjacent said control shaft and disposed inwardly of said conical head member relative to the axis of said control shaft and a second conical surface disposed outwardly of and in encircling relation to said conical head member to provide respectively for relatively slow and relatively fast circumferential adjustment of said weight means relative to the body.

References Cited in the file of this patent UNITED STATES PATENTS 2,241,637 Ernst et al May 13, 1941 2,662,396 Hunter Dec. 15, 1953 2,675,200 Wohlforth Apr. 13, 1954 2,680,974 Hunter June l5, 1954 2,696,108 Hrebicek Dec. 7, 1954 2,723,555 Hunter Nov. 15, 1955 2,731,833 Jones Jan. 24, 1956 2,779,196 Hemmeter Jan. 29, 1957 

